Nigral hyperintensity on SMWI according to clinical diagnosis
| Control Participants (n = 29) | Patients with PD (n = 109) | P Value | |
|---|---|---|---|
| Bilateral presence | 26 | 36 | < .001a |
| Unilateral loss | 1 | 17 | |
| Bilateral loss | 2 | 56 |
a P values < .05 indicate statistical significance.